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Wikipedia [note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki -based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.
The spike protein is very large, often 1200 to 1400 amino acid residues long; [8] it is 1273 residues in SARS-CoV-2. [5] It is a single-pass transmembrane protein with a short C-terminal tail on the interior of the virus, a transmembrane helix, and a large N-terminal ectodomain exposed on the virus exterior. [5] [7]
COVID-19 pandemicin the United Kingdom,British Overseas Territories and Crown Dependencies. On 23 March 2020, Prime Minister Boris Johnson announced a nationwide lockdown to curb a widening outbreak of COVID-19, closing many sectors and ordering the public to stay at home. This was incrementally lifted, starting from several weeks later.
2034. The FIFA World Cup, often simply called the World Cup, is an international association football competition between the senior men's national teams of the members of the Fédération Internationale de Football Association ( FIFA ), the sport's global governing body. The tournament has been held every four years since the inaugural ...
YouTube is an American online video sharing and social media platform owned by Google. Accessible worldwide, [note 1] it was launched on February 14, 2005, by Steve Chen, Chad Hurley, and Jawed Karim, three former employees of PayPal.